i lent PS to a friend (who finally wants to see what all the 'fuss' is about after the 7th book is now out) so i cant do another re-read, which i am really looking forward to , so i can see even more foreshadowing, but other than harry's first trip to gringotts and mentioning the dragon i also thought it was interesting that at the end of school feast ron, hermione, neville and harry all get points from dumbledore (in that order) and funnily enough that is the order they destroy horcrux's (the tiara doesnt count as crabbe/goyle did that),
i will starting some more re-reading threads like i did before DH when i have more time, if anyone wants to start the ball rolling go ahead, im really looking forward to reading all 7 books again with all the answers there!

i was also thinking how the tiara was kind of done for them, remember in PS when harry is going through the tasks and he comes across the troll that has already been knocked by quirrel out so he doesn't have to do that one, another baddy helping him by accident.